Craniofacial Skeletal Measurements Based on Computed Tomography: Part I. Accuracy and Reproducibility

TLDR

Computed tomography is a valuable tool for managing craniofacial anomalies. The study aimed to determine whether CT measurements of the upper craniofacial skeleton accurately reflect the bony anatomy and to evaluate how head tilt affects that accuracy. Researchers compared direct measurements from five dry skulls of various ages to axial CT scans of the same skulls and examined the impact of head tilt on measurement accuracy. CT measurements showed excellent agreement with direct skull measurements, with errors under 5% when head tilt was within 4°, indicating that CT provides objective data that can complement clinical assessments of craniofacial deformities.

Abstract

Computed tomography (CT) is a useful modality for the management of craniofacial anomalies. A study was undertaken to assess whether CT measurements of the upper craniofacial skeleton accurately represent the bony region imaged. Measurements taken directly from five dry skulls (approximate ages: adults, over 18 years; child, 4 years; infant, 6 months) were compared to those from axial CT scans of these skulls. Excellent agreement was found between the direct (dry skull) and indirect (CT) measurements. The effect of head tilt on the accuracy of these measurements was investigated. The error was within clinically acceptable limits (less than 5 percent) if the angle was no more than + 4° from baseline (0°). Objective standardized information gained from CT should complement the subjective clinical data usually collected for the treatment of craniofacial deformities.